How to identify whether a magnet sample can withstand high temperature?

Magnets have been widely used in modern industrial production. In the production process, we often need to use high temperature environment, and high temperature resistant magnets are particularly important. However, how to identify whether a magnet sample can withstand high temperature? Let's take a look below.

First of all, to identify whether a magnet sample is resistant to high temperature, we need to understand the material of the magnet itself. Under high temperature environment, the coercivity of some common magnet materials, such as hard ferrite and Nd-Fe-B, will drop significantly, causing them to lose magnetism. Magnet materials with higher coercivity, such as NdFeB and ferrite, still have strong magnetism at high temperature, which requires us to choose materials with high coercivity when choosing magnet materials.

Secondly, we can conduct some experiments to determine whether the magnet is resistant to high temperature. For example, we can put the magnet sample into a high temperature furnace for heating to observe whether the performance of the magnet will change significantly. In addition, we can also soak the magnet sample in high temperature water to observe whether the performance of the magnet will change significantly. If the magnet can stably maintain a certain magnetic force under high temperature environment, then it can be considered to be resistant to high temperature.

Again, we can judge whether the magnet is resistant to high temperatures from its appearance. In high temperature environments, some common magnet materials, such as hard ferrite and Nd-Fe-B, will undergo thermal expansion, resulting in cracking and deformation of magnet samples. High-quality high-temperature resistant magnets can not only maintain strong magnetism, but also maintain stability and will not undergo thermal expansion.

In order to ensure the high-temperature resistance of the magnet, we need to select magnet materials with high coercivity and conduct experiments to test their stability in high-temperature environments. At the same time, we also need to judge whether the magnet sample is resistant to high temperatures from its appearance.